如何使用JavaFX从TabPane中获取选定的选项卡？

Question

我正在搜索如何TabPane通过单击带有JavaFX的按钮来获取所选选项卡.我试过用ChangeListener它做但它还没有用.

那我该怎么办呢？

Answer 1

与许多JavaFX控件一样,SelectionModel首先有一个.

tabPane.getSelectionModel().getSelectedItem(); 获取当前选定的选项卡,或者替换选定选项卡getSelectedIndex()的索引.

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.Tab;
import javafx.scene.control.TabPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class TabSelect extends Application {

    @Override
    public void start(Stage primaryStage) {
        TabPane tabPane = new TabPane();
        tabPane.getTabs().addAll(new Tab("tab 1"),
                                 new Tab("tab 2"),
                                 new Tab("tab 3"));
        Button btn = new Button();
        btn.setText("Which tab?");
        Label label = new Label();
        btn.setOnAction((evt)-> {
            label.setText(tabPane.getSelectionModel().getSelectedItem().getText());
        });

        VBox root = new VBox(10);
        root.getChildren().addAll(tabPane, btn, label);
        Scene scene = new Scene(root, 300, 300);
        primaryStage.setScene(scene);
        primaryStage.show();

        //you can also watch the selectedItemProperty
        tabPane.getSelectionModel().selectedItemProperty().addListener((obs,ov,nv)->{
            primaryStage.setTitle(nv.getText());
        });

    }

    public static void main(String[] args) { launch(args); }

}